I couldn't find anything with Google search. Might be better off contacting Airstream to see if you can get one they put in their 23fb or 30fb. The Dicor website said to contact your RV dealer. You can also search the marine parts websites. They offer Springfield pedestals but I don't think they have the adjustable table top mount on their adjustable pedestals.
I'm thinking about converting my heavy rear dinette table to a pedestal table. I think the only issue is mounting. Bolts are preferred to screws so that would mean accessing the subfloor from below and removing a belly pan or two.
2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
2010 Tundra 5.7L, Double Cab, 2wd, White